add t2t script

bin/t2t

@@ -0,0 +1,65 @@
+#! /usr/bin/env python3
+# encoding: utf-8
+
+usage = """
+Converts between various subsets of ISO 8601 datetimes and unix timestamps.
+
+Usage:
+
+→ current unix time
+$ t2t
+1609849499
+
+→ convert unix time to ISO 8601
+$ t2t 590055912
+1988-09-12 10:25:12
+
+→ convert ISO 8601 subsets into unix time
+$ t2t 1988-09-12
+590018400
+
+$ t2t 1988-09-12 10:25
+590055900
+
+$ t2t 1988-09-12 10:25:12
+590055912
+""".strip()
+
+import sys
+import datetime
+
+targets = sys.argv[1:]
+l = len(targets)
+
+if l == 0:
+	# no args
+	D = datetime.datetime.now()
+	print(int(D.timestamp()))
+
+elif l == 1:
+	if targets[0].isdigit():
+		# time_t to dt
+		D = datetime.datetime.fromtimestamp(int(targets[0]))
+		print(D.strftime("%Y-%m-%d %H:%M:%S"))
+	else:
+		try:
+			D = datetime.datetime.strptime(targets[0], "%Y-%m-%d")
+		except ValueError:
+			print(usage)
+			sys.exit(1)
+		
+		print(int(D.timestamp()))
+
+elif l == 2:
+	if targets[1].count(":") == 2:
+		fmt = "%Y-%m-%d %H:%M:%S"
+	else:
+		fmt = "%Y-%m-%d %H:%M"
+	
+	try:
+		D = datetime.datetime.strptime(" ".join(targets), fmt)
+	except ValueError:
+		print(usage)
+		sys.exit(1)
+	
+	print(int(D.timestamp()))